You can do that at cPanel - "Email" - "Email Authentication".
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
Go to cPanel - "Mail" - "Email accounts". Complete all of the fields and click “create account”...
This is probably due to your quota being full. You will need to delete some of your mail to make...
Go to cPanel: click "Mail" - "MX entry", choose "Remote Mail Exchanger". Click "Add New Record"...
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